CVE-2026-27912 Windows Kerberos Elevation of Privilege Vulnerability
An authorized attacker can elevate privileges over an adjacent network due to improper authorization in Windows Kerberos.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-27912?
CVE-2026-27912 is a high-severity vulnerability in Microsoft Windows Server 2012, published on 14 Apr 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
Improper authorization in Windows Kerberos allows an authorized attacker to elevate privileges over an adjacent network.
Weakness: CWE-285
Which versions are affected by CVE-2026-27912?
It affects 6 products.
Products include Microsoft Windows Server 2012, Microsoft Windows Server 2016, Microsoft Windows Server 2019, Microsoft Windows Server 2022, Microsoft Windows Server 2022 23h2, Microsoft Windows Server 2025.
How do I fix CVE-2026-27912?
No fix has been published for CVE-2026-27912 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-27912 being exploited?
There is no known exploitation of CVE-2026-27912 in the wild and no public exploit code.
Public exploit code: 3 proofs of concept on GitHub.
Other vulnerabilities in Microsoft Windows Server 2012
- CVE-2025-59287 Microsoft Windows Server Update Service (WSUS) Deserialization of Untrusted Data
- CVE-2026-69595 Windows Services for NFS ONCRPC XDR Driver Remote Code Execution Vulnerability
- CVE-2026-78445 Windows Services for NFS ONCRPC XDR Driver Remote Code Execution Vulnerability
- CVE-2026-41089 Windows Netlogon Remote Code Execution Vulnerability
- CVE-2024-43639 Windows KDC Proxy Remote Code Execution Vulnerability
Sources
Also known as GHSA-hm2p-4g74-cx7c.